Steam-actuated valve



(No Model.) V

F. A. ORESSWELL.

STEAM AQTUATED VALVE. No. 358,804. PatentedMzir. 1, 1887 Fig.1

WITNESSES I IJV'V'E'JV'TOR MM: -WMZ Attorneys NlTE STATES arnnr rrron STEAM-ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 358,804, dated lVIarch 1, 1887.

Application filel July 19, 1886. Serial No. 208,487. (No model.)

To all whom it may concern:

Be it known that l, FRANCIS ALBERT Cariss- WELL, acitizen of the United States, residing at Strongstown, in the county of Indiana and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Aetuated Valves for Steam-Engines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 of the drawings is a representation of a vertical longitudinal section. Fig. 2 isa transverse section on line a: 00, Fig. 1.

' This invention relates to improvements in the steam-actuated valves for reciprocating engines, having special reference to that class in which the main valve, gnoving in a separate cylinder, has the steam admitted alternately against each end of it by the motion of an auxiliary reciprocating valve, which alternately opens steam-ports communicating with the ends of the main valvecylinders; and it consists in the construction and novel arrangement of parts, as hereinafter described, and pointed out in the claims.

Referring by letter to the accompanying drawings, A designates the steam chest, M the cylinder, M the piston, and m the pistonrod.

B isa cylindrical rotary valve reciprocating in a steam chamber or cylinder, the ends of which are indicated by the letters G H, as shown.

a is the point of junction of the steam-pipe from the boiler with stcamchest, and G D are inclined steam ways or passages through the rotary valve B, for conveying steam from the interior a of the steamchest to the respective rear and front ends of the cylinders, O and P being the steam-ports for said ends.

E is a cog-wheel on the rotary valve, standing in a recess or chamber, E, in the walls of the valve-cylinder, and F is a rack-bar, which passes through proper openings in the walls of said cylinder and meshes with the wheel E.

In the drawings the inclined steamway O is shown as opening into the port 0, while the similarly-inclined way D is cutoff from the corresponding port 1?. Now, by moving the rack-bar so as to cause the cog-wheel to make one'half turn, the rotary valve will also turn, and the inclinations 0f the steamways O D will be reversed, so that D will open into its port P, and G will be the cut-off from the port 0, and the engine will be thus reversed.

j k are swinging gates or valves which open and close the steam and exhaust ports. As shown in the drawings, the gate j permits steam to flow through the port 0 into the rear end of the cylinder, but prevents it from entering the exhaust-chamber I and escaping thence through the exhaust tube or opening (1. The gate it, however, cuts on" steam, but allows the front end ofthe cylinder to exhaust through the tube or port R.

L is an auxiliary slide -valve moving in a chamber between the cylinder and the ex haust-chamber, the shell of the latter forming its roof and that of the former its floor.

:4 and s are ports in the floor of the valvechambcr, situated at equal and suitable distances from the rear and front ends of the cyl inder.

y and a are ports in the roof of the valvechamber, not vertically above the respective ports a and s, but at equal and suitable distances outward from the same, or respectively toward the rear and front ends of the cylinder M. 1

w w are ports through the valve L, nearer together than the ports 2 and s, so that when the ports 20 s communicate, as shown in the drawings, the port w will be on the inner side of the port 2.

a: is the orifice of a tube or passage-way, or, which communicates with the end H of the main valve chamber or cylinder, and c is the similar orifice of the tube or way, a, comn'iunicating with the end G- of the same.

Z Z are extensions or tappetarms on the rear and front ends of the valve L.

The operation of the invention is as follows: The parts being in the position shown in Fig. 1, steam flows through the ports 0 and 0 into the cylinder M, driving the piston M outward. The steam opens the valve or gate 9', as shown, and pressing on the tappet-arm Zslides the valve L, moving the valve or gate k outwardly,

The valve also so as to open the exhaust. I

moves sufficiently to cut off the ports a and w from each other, but allowing communication between the end G of the valve-cylinder and the exhaust-chamber I, and to bring the ports 8 w and orifice in line. When the piston passes the ports, the steam behind it escapes through the orifice x and pipe 00 to the end G of the valve-cylinder, and moves the rotary valve B outward, so as to bring the steamways D P into communication, but cutting off the way 0 from the port 0. The motion of the piston is then reversed, all the parts acting in the opposite direction in the manner described. The manner of reversing is heretofore explained. In double-cyl-indered engines, like locomotives, the rack-bar F may be made long enough to engage the cog-wheels on the cylindrical wheels of both cylinders in the described manner, so that both will be reversed simultaueously.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s'- 1. The combination of the steam-chest, the cylindrical rotary valve having the steamways O D made through it, the valve-chamber forming at its ends steam-cylinders, of which the valve is'the piston, the ports 0 P, the exhaustchamber, the swinging gates j k, the piston and cylinder, and means, substantially as described, to slide the rotary valve to reverse the O P, the cylindrical rotary valve having the steamways O D, the valve-chamber G H, the exhaust-chamber I, the swinging gates thereof, the slide-valve L, having the extensions H and ports w w, the ports 2 s in the floor and y a in the roof of the valve-chamber, and the pipes c 00', having the orifices c w, and communicating with the ends H G, respectively, of 4 5 the main valve-chamber, substantially as specified.

3. The combination of the steam-chest piston cylinder, having ports 0 P, exl1aust-chamher I, and swing gates j k, with the valvechamber G H, cylindrical rotary valve B, provided with the inclined steamways OD, gearwheel E on said rotary valve, and rack-bar F, engaging said gear-wheel to reverse the valve, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS ALBERT OBESSWELL.

Witnesses:

ROBERT E. ORESSWELL, EMMA TROXELL. 

